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where can I find all possible endings? 

There's only one good ending and several bad endings. Once you get the good ending, if you start the game and skip through to when there's a decision, you will always be able to choose the bad option and feel William's wrath as a result every time. I did a play through of this entire game and got every single ending (1 good and all the bad endings). The good ending is out now on my channel, and all the bloody ways to die from the bad ones are in the second episode that'll go out on Friday if you're willing to wait. :)